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Loans and Allowance for Loan Losses, Part II (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 25,018,000   $ 25,018,000   $ 28,037,000
Current 2,598,540,000   2,598,540,000   2,616,482,000
Total Loans Receivable 2,623,558,000 $ 2,400,160,000 2,623,558,000 $ 2,400,160,000 2,644,519,000
Total Loans 90 Days & Accruing 0   $ 0   0
Number of days past due when interest is not accrued     ninety days    
Period of satisfactory performance before returning to accrual status     not less than six months    
Loans with a specific allowance [Abstract]          
Recorded Balance 19,991,000   $ 19,991,000   32,603,000
Unpaid Principal Balance 22,233,000   22,233,000   34,178,000
Specific Allowance 1,576,000   1,576,000   3,279,000
Loans without a specific allowance [Abstract]          
Recorded Balance 7,807,000   7,807,000   15,385,000
Unpaid Principal Balance 9,136,000   9,136,000   17,126,000
Total Loans [Abstract]          
Recorded Balance 27,798,000   27,798,000   47,988,000
Unpaid Principal Balance 31,369,000   31,369,000   51,304,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 27,028,000 33,588,000 29,873,000 24,781,000  
Interest income recognized 91,000 478,000 267,000 649,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 21,429,000   21,429,000   27,298,000
Interest Lost on Nonaccrual Loans     915,000 $ 1,096,000  
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 5,944,000   5,944,000   9,956,000
Financing Receivable Modifications Performing Recorded Investment 2,774,000   $ 2,774,000   2,451,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1    
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     10 19  
Financing Receivables, Modifications during Period, Balance     $ 1,708,000 $ 1,144,000  
Subsequent Default, Number of Days Past Due     90 days    
Loans Receivable, Modifications, Allowance 249,000   $ 249,000   1,418,000
Real Estate Acquired Through Foreclosure 4,348,000   4,348,000   2,534,000
Mortgage Loans Secured By Real Estate In Foreclosure     1,939,000   425,000
Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,509,191,000   2,509,191,000   2,511,889,000
Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 41,050,000   41,050,000   58,716,000
Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 72,995,000   72,995,000   73,914,000
Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 322,000   322,000   0
Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   503,000
Current 68,821,000   68,821,000   50,116,000
Total Loans Receivable 68,821,000   68,821,000   50,619,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 263,000   263,000   2,559,000
Unpaid Principal Balance 263,000   263,000   2,559,000
Specific Allowance 0   0   14,000
Loans without a specific allowance [Abstract]          
Recorded Balance 180,000   180,000   48,000
Unpaid Principal Balance 180,000   180,000   48,000
Total Loans [Abstract]          
Recorded Balance 443,000   443,000   2,607,000
Unpaid Principal Balance 443,000   443,000   2,607,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 755,000 395,000 765,000 167,000  
Interest income recognized 8,000 22,000 24,000 29,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 180,000   180,000   377,000
Construction and land development | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 67,941,000   67,941,000   49,794,000
Construction and land development | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 418,000   418,000   471,000
Construction and land development | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 462,000   462,000   354,000
Construction and land development | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,521,000   3,521,000   804,000
Current 226,194,000   226,194,000   230,896,000
Total Loans Receivable 229,715,000   229,715,000   231,700,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 0   0   0
Unpaid Principal Balance 0   0   0
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 289,000   289,000   309,000
Unpaid Principal Balance 289,000   289,000   309,000
Total Loans [Abstract]          
Recorded Balance 289,000   289,000   309,000
Unpaid Principal Balance 289,000   289,000   309,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 932,000 620,000 935,000 182,000  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 289,000   289,000   309,000
Agricultural real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 217,562,000   217,562,000   221,047,000
Agricultural real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 10,260,000   10,260,000   7,805,000
Agricultural real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,893,000   1,893,000   2,848,000
Agricultural real estate | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 10,488,000   10,488,000   10,478,000
Current 336,882,000   336,882,000   363,040,000
Total Loans Receivable 347,370,000   347,370,000   373,518,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 5,499,000   5,499,000   4,565,000
Unpaid Principal Balance 5,696,000   5,696,000   4,952,000
Specific Allowance 486,000   486,000   234,000
Loans without a specific allowance [Abstract]          
Recorded Balance 3,676,000   3,676,000   3,680,000
Unpaid Principal Balance 4,051,000   4,051,000   4,769,000
Total Loans [Abstract]          
Recorded Balance 9,175,000   9,175,000   8,245,000
Unpaid Principal Balance 9,747,000   9,747,000   9,721,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 9,521,000 7,574,000 9,629,000 5,672,000  
Interest income recognized 21,000 137,000 63,000 188,000  
Loans Receivable, Modifications, Still Accruing Interest 1,478,000 1,908,000 1,478,000 $ 1,908,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 7,631,000   7,631,000   5,762,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 1,979,000   1,979,000   2,472,000
Financing Receivable Modifications Performing Recorded Investment 1,478,000   $ 1,478,000   1,769,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 15  
Financing Receivables, Modifications during Period, Balance     $ 44,000 $ 604,000  
1-4 Family residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 323,757,000   323,757,000   352,583,000
1-4 Family residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 5,584,000   5,584,000   5,526,000
1-4 Family residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 18,029,000   18,029,000   15,409,000
1-4 Family residential properties | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,339,000   1,339,000   3,104,000
Current 153,520,000   153,520,000   180,947,000
Total Loans Receivable 154,859,000   154,859,000   184,051,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 2,556,000   2,556,000   4,465,000
Unpaid Principal Balance 2,556,000   2,556,000   4,465,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 0   0   7,597,000
Unpaid Principal Balance 0   0   7,597,000
Total Loans [Abstract]          
Recorded Balance 2,556,000   2,556,000   12,062,000
Unpaid Principal Balance 2,556,000   2,556,000   12,062,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 1,559,000 3,164,000 1,561,000 1,414,000  
Interest income recognized 14,000 126,000 42,000 169,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 1,437,000   1,437,000   2,105,000
Multifamily residential properties | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 138,351,000   138,351,000   163,845,000
Multifamily residential properties | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 5,619,000   5,619,000   8,144,000
Multifamily residential properties | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 10,889,000   10,889,000   12,062,000
Multifamily residential properties | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,620,000   3,620,000   5,496,000
Current 951,372,000   951,372,000   901,354,000
Total Loans Receivable 954,992,000   954,992,000   906,850,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 6,039,000   6,039,000   12,517,000
Unpaid Principal Balance 6,643,000   6,643,000   12,804,000
Specific Allowance 928,000   928,000   1,553,000
Loans without a specific allowance [Abstract]          
Recorded Balance 1,533,000   1,533,000   983,000
Unpaid Principal Balance 1,284,000   1,284,000   1,201,000
Total Loans [Abstract]          
Recorded Balance 7,572,000   7,572,000   13,500,000
Unpaid Principal Balance 7,927,000   7,927,000   14,005,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 6,232,000 11,932,000 7,522,000 8,595,000  
Interest income recognized 43,000 188,000 128,000 256,000  
Loans Receivable, Modifications, Still Accruing Interest 1,101,000 679,000 1,101,000 $ 679,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 4,324,000   4,324,000   8,457,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 1,708,000   1,708,000   1,706,000
Financing Receivable Modifications Performing Recorded Investment 1,101,000   $ 1,101,000   676,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     3 1  
Financing Receivables, Modifications during Period, Balance     $ 1,462,000 $ 437,000  
Commercial real estate | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 923,345,000   923,345,000   861,086,000
Commercial real estate | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 8,783,000   8,783,000   16,035,000
Commercial real estate | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 22,542,000   22,542,000   29,729,000
Commercial real estate | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 322,000   322,000   0
Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 903,000   903,000   83,000
Current 120,747,000   120,747,000   135,794,000
Total Loans Receivable 121,650,000   121,650,000   135,877,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 104,000   104,000   36,000
Unpaid Principal Balance 688,000   688,000   504,000
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 752,000   752,000   631,000
Unpaid Principal Balance 169,000   169,000   163,000
Total Loans [Abstract]          
Recorded Balance 856,000   856,000   667,000
Unpaid Principal Balance 857,000   857,000   667,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 852,000 752,000 800,000 642,000  
Interest income recognized 1,000 0 2,000 0  
Loans Receivable, Modifications, Still Accruing Interest 59,000 0 59,000 $ 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 797,000   797,000   667,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 688,000   $ 688,000   499,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 0  
Financing Receivables, Modifications during Period, Balance     $ 59,000 $ 0  
Agricultural loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 113,116,000   113,116,000   127,863,000
Agricultural loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 3,980,000   3,980,000   7,581,000
Agricultural loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 4,554,000   4,554,000   433,000
Agricultural loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,431,000   4,431,000   5,329,000
Current 539,506,000   539,506,000   551,682,000
Total Loans Receivable 543,937,000   543,937,000   557,011,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 5,392,000   5,392,000   8,292,000
Unpaid Principal Balance 6,249,000   6,249,000   8,723,000
Specific Allowance 161,000   161,000   1,475,000
Loans without a specific allowance [Abstract]          
Recorded Balance 856,000   856,000   1,660,000
Unpaid Principal Balance 2,447,000   2,447,000   2,027,000
Total Loans [Abstract]          
Recorded Balance 6,248,000   6,248,000   9,952,000
Unpaid Principal Balance 8,696,000   8,696,000   10,750,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 6,479,000 8,909,000 7,897,000 8,109,000  
Interest income recognized 4,000 5,000 7,000 $ 7,000  
Loans Receivable, Modifications, Still Accruing Interest 131,000   131,000    
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 6,117,000   6,117,000   8,990,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 1,431,000   1,431,000   5,112,000
Financing Receivable Modifications Performing Recorded Investment 131,000   $ 131,000   0
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     4 2  
Financing Receivables, Modifications during Period, Balance     $ 131,000 $ 99,000  
Commercial and industrial loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 527,005,000   527,005,000   535,186,000
Commercial and industrial loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 3,504,000   3,504,000   9,967,000
Commercial and industrial loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 13,428,000   13,428,000   11,858,000
Commercial and industrial loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 716,000   716,000   1,543,000
Current 82,458,000   82,458,000   89,973,000
Total Loans Receivable 83,174,000 69,212,000 83,174,000 69,212,000 91,516,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 138,000   138,000   169,000
Unpaid Principal Balance 138,000   138,000   171,000
Specific Allowance 1,000   1,000   3,000
Loans without a specific allowance [Abstract]          
Recorded Balance 521,000   521,000   471,000
Unpaid Principal Balance 716,000   716,000   1,006,000
Total Loans [Abstract]          
Recorded Balance 659,000   659,000   640,000
Unpaid Principal Balance 854,000   854,000   1,177,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 698,000 234,000 764,000 0  
Interest income recognized 0 0 1,000 0  
Loans Receivable, Modifications, Still Accruing Interest 5,000 4,000 5,000 $ 4,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 654,000   654,000   625,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 138,000   138,000   167,000
Financing Receivable Modifications Performing Recorded Investment 5,000   $ 5,000   6,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     1 1  
Financing Receivables, Modifications during Period, Balance     $ 12,000 $ 4,000  
Consumer loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 81,828,000   81,828,000   90,133,000
Consumer loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 148,000   148,000   177,000
Consumer loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 1,198,000   1,198,000   1,206,000
Consumer loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   697,000
Current 119,040,000   119,040,000   112,680,000
Total Loans Receivable 119,040,000   119,040,000   113,377,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Specific Allowance 0   0   0
Loans without a specific allowance [Abstract]          
Recorded Balance 0   0   6,000
Unpaid Principal Balance 0   0   6,000
Total Loans [Abstract]          
Recorded Balance 0   0   6,000
Unpaid Principal Balance 0   0   6,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 0 8,000 0 0  
Interest income recognized 0 0 0 0  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 0   0   6,000
All other loans | Pass          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 116,286,000   116,286,000   110,352,000
All other loans | Special Mention          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 2,754,000   2,754,000   3,010,000
All other loans | Substandard          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   15,000
All other loans | Doubtful          
Loans Receivable Aging Analysis [Abstract]          
Total Loans Receivable 0   0   0
Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 18,968,000   18,968,000   20,385,000
Current 1,736,789,000   1,736,789,000   1,726,353,000
Total Loans Receivable 1,755,757,000   1,755,757,000   1,746,738,000
Total Loans 90 Days & Accruing 0   0   0
Loans with a specific allowance [Abstract]          
Recorded Balance 14,357,000   14,357,000   24,106,000
Unpaid Principal Balance 15,158,000   15,158,000   24,780,000
Specific Allowance 1,414,000   1,414,000   1,801,000
Loans without a specific allowance [Abstract]          
Recorded Balance 5,678,000   5,678,000   12,617,000
Unpaid Principal Balance 5,804,000   5,804,000   13,924,000
Total Loans [Abstract]          
Recorded Balance 20,035,000   20,035,000   36,723,000
Unpaid Principal Balance 20,962,000   20,962,000   38,704,000
Average recorded investment and interest income recognized [Abstract]          
Average investment in impaired loans 18,999,000 23,685,000 20,412,000 16,030,000  
Interest income recognized 86,000 $ 473,000 257,000 $ 642,000  
Balances of Nonaccrual Loans [Abstract]          
Recorded balance of nonaccrual loans 13,861,000   13,861,000   17,010,000
Troubled Debt Restructuring [Abstract]          
Troubled Debt Restructurings Balance 3,687,000   3,687,000   4,178,000
Financing Receivable Modifications Performing Recorded Investment 2,579,000   $ 2,579,000   2,445,000
Recorded Balance of Troubled Debt Restructurings [Abstract]          
Financing Receivables, Modifications during Period, Number     4 16  
Financing Receivables, Modifications during Period, Balance     $ 1,506,000 $ 1,041,000  
Financing Receivables, 30 to 59 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 7,643,000   7,643,000   9,370,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   460,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 758,000   758,000   0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,848,000   4,848,000   3,347,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 47,000   47,000   1,149,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 674,000   674,000   1,349,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 459,000   459,000   63,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 434,000   434,000   1,417,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 423,000   423,000   888,000
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   697,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 6,327,000   6,327,000   6,305,000
Financing Receivables, 60 to 89 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,503,000   4,503,000   4,353,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   43,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,962,000   1,962,000   804,000
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,131,000   1,131,000   3,051,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   89,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 137,000   137,000   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,173,000   1,173,000   10,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 100,000   100,000   356,000
Financing Receivables, 60 to 89 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 3,093,000   3,093,000   3,987,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 12,872,000   12,872,000   14,314,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 801,000   801,000   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 4,509,000   4,509,000   4,080,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 1,292,000   1,292,000   1,955,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,946,000   2,946,000   4,058,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 307,000   307,000   20,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 2,824,000   2,824,000   3,902,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 193,000   193,000   299,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | All other loans          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due 0   0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans secured by real estate          
Loans Receivable Aging Analysis [Abstract]          
Total Past Due $ 9,548,000   $ 9,548,000   $ 10,093,000